CBSE Class 12 Ray Optics and Optical Instruments Multiple Choice Questions with Answers. MCQ Questions Class 12 Ray Optics and Optical Instruments with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Ray Optics and Optical Instruments MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Ray Optics and Optical Instruments with Answers - Set - 1
Question 1:
When a glass slab is placed on a cross made on a sheet, the cross appears raised by 1 cm. The thickness of the glass is 3 cm. The critical angle for glass is
(a) sin-1 (0.33)
(b) sin-1 (0.5)
(c) sin-1 (0.66)
(d) sin-1 (√3/2)
Correct Answer – (C)
Question 2 :
If the refractive index for water is 4/3 and the velocity of light in vacuum is 3 x 1010 cm s-1, the time taken by light in travelling a distance of 500 m in water is
(a) 2.22 × 10-1 s
(b) 2.22 × 10-6 s
(c) 2.22 × 10-8 s
(d) 2.22 × 10-10 s.
Correct Answer – (B)
Question 3 :
A thin prism P, with angle 4° and made from glass of refractive index 1.54, is combined with another thin prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism P2 is:
(a) 5.33°
(b) 4°
(c) 2.6°
(d) 3°
Correct Answer – (D)
Question 4 :
A diver in a swimming pool wants to signal his distress to a person standing on the edge of the pool by flashing his water proof flash light:
(a) He has to direct the beam horizontally.
(b) He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection.
(c) He has to direct the beam at angle to the vertical which is slightly more than the critical angle of incidence for total internal reflection.
(d) He must direct the beam vertically upward.
Correct Answer – (C)
Question 5 :
A spherical mirror forms a real image of a point object placed in front of it. The distance of the image and object from the mirror is 30 cm and 20 cm respectively. The focal length and nature of the mirror is:
(a) 120 cm; convex
(b) 60 cm convex
(c) 60 mm, concave
(d) 120 mm; concave
Correct Answer – (D)
MCQ Questions Class 12 Ray Optics and Optical Instruments with Answers
Question 6 :
The equivalent path in Q. 8. is in:
(a) 66.64 m
(b) 666.64 m
(c) 666.0 m
(d) 1.000 m
Correct Answer – (B)
Question 7 :
When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If the refractive index of the material of prism is 29−−√ the angle of prism will be
(a) 30°
(b) 40°
(c) 50°
(d) 60°
Correct Answer – (D)
Question 8 :
A fish is a little away below the surface of a lake. If the critical angle is 49°, the fish could see things above the water surface within an angular range of θ°, where
(a) θ = 49°
(b) θ – 98°
(c) θ = 90°
(b) 24.5°
Correct Answer – (B)
Question 9 :
If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is :
(a) 3 × 108 ms-1
(b) 6 × 108 ms-1
(c) 1.5 × 108 ms-1
(d) 15 × 108 ms-1
Correct Answer – (C)
Question 10 :
A ray of light is incident on a plane mirror at an angle of incidence 30°. The ray after reflection is deviated through
(a) 30°
(b) 90°
(c) 60°
(d) 120°
Correct Answer – (D)
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